Compilare: main.cpp: In function 'int main()': main.cpp:43:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for(int j=0;j<a.size()-1;j++) | ~^~~~~~~~~~~ main.cpp:60:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<graf>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for (int i=0;i<g[vfmin].size();i++) | ~^~~~~~~~~~~~~~~~